[S390] kdump backend code
This patch provides the architecture specific part of the s390 kdump support. Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Michael Holzheu
committed by
Martin Schwidefsky
Martin Schwidefsky
parent
7f0bf656c6
commit
60a0c68df2
@ -42,6 +42,9 @@
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#include <linux/reboot.h>
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#include <linux/topology.h>
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#include <linux/ftrace.h>
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#include <linux/kexec.h>
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#include <linux/crash_dump.h>
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#include <linux/memory.h>
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#include <asm/ipl.h>
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#include <asm/uaccess.h>
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@ -57,6 +60,7 @@
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#include <asm/ebcdic.h>
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#include <asm/compat.h>
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#include <asm/kvm_virtio.h>
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#include <asm/diag.h>
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long psw_kernel_bits = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_PRIMARY |
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PSW_MASK_MCHECK | PSW_DEFAULT_KEY);
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@ -435,6 +439,9 @@ static void __init setup_resources(void)
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for (i = 0; i < MEMORY_CHUNKS; i++) {
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if (!memory_chunk[i].size)
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continue;
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if (memory_chunk[i].type == CHUNK_OLDMEM ||
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memory_chunk[i].type == CHUNK_CRASHK)
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continue;
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res = alloc_bootmem_low(sizeof(*res));
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res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
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switch (memory_chunk[i].type) {
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@ -479,6 +486,7 @@ static void __init setup_memory_end(void)
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unsigned long max_mem;
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int i;
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#ifdef CONFIG_ZFCPDUMP
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if (ipl_info.type == IPL_TYPE_FCP_DUMP) {
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memory_end = ZFCPDUMP_HSA_SIZE;
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@ -550,6 +558,187 @@ static void __init setup_restart_psw(void)
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copy_to_absolute_zero(&S390_lowcore.restart_psw, &psw, sizeof(psw));
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}
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#ifdef CONFIG_CRASH_DUMP
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/*
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* Find suitable location for crashkernel memory
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*/
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static unsigned long __init find_crash_base(unsigned long crash_size,
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char **msg)
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{
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unsigned long crash_base;
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struct mem_chunk *chunk;
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int i;
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if (memory_chunk[0].size < crash_size) {
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*msg = "first memory chunk must be at least crashkernel size";
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return 0;
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}
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if (is_kdump_kernel() && (crash_size == OLDMEM_SIZE))
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return OLDMEM_BASE;
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for (i = MEMORY_CHUNKS - 1; i >= 0; i--) {
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chunk = &memory_chunk[i];
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if (chunk->size == 0)
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continue;
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if (chunk->type != CHUNK_READ_WRITE)
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continue;
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if (chunk->size < crash_size)
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continue;
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crash_base = (chunk->addr + chunk->size) - crash_size;
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if (crash_base < crash_size)
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continue;
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if (crash_base < ZFCPDUMP_HSA_SIZE_MAX)
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continue;
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if (crash_base < (unsigned long) INITRD_START + INITRD_SIZE)
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continue;
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return crash_base;
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}
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*msg = "no suitable area found";
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return 0;
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}
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/*
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* Check if crash_base and crash_size is valid
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*/
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static int __init verify_crash_base(unsigned long crash_base,
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unsigned long crash_size,
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char **msg)
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{
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struct mem_chunk *chunk;
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int i;
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/*
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* Because we do the swap to zero, we must have at least 'crash_size'
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* bytes free space before crash_base
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*/
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if (crash_size > crash_base) {
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*msg = "crashkernel offset must be greater than size";
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return -EINVAL;
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}
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/* First memory chunk must be at least crash_size */
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if (memory_chunk[0].size < crash_size) {
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*msg = "first memory chunk must be at least crashkernel size";
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return -EINVAL;
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}
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/* Check if we fit into the respective memory chunk */
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for (i = 0; i < MEMORY_CHUNKS; i++) {
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chunk = &memory_chunk[i];
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if (chunk->size == 0)
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continue;
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if (crash_base < chunk->addr)
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continue;
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if (crash_base >= chunk->addr + chunk->size)
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continue;
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/* we have found the memory chunk */
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if (crash_base + crash_size > chunk->addr + chunk->size) {
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*msg = "selected memory chunk is too small for "
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"crashkernel memory";
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return -EINVAL;
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}
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return 0;
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}
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*msg = "invalid memory range specified";
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return -EINVAL;
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}
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/*
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* Reserve kdump memory by creating a memory hole in the mem_chunk array
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*/
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static void __init reserve_kdump_bootmem(unsigned long addr, unsigned long size,
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int type)
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{
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create_mem_hole(memory_chunk, addr, size, type);
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}
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/*
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* When kdump is enabled, we have to ensure that no memory from
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* the area [0 - crashkernel memory size] and
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* [crashk_res.start - crashk_res.end] is set offline.
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*/
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static int kdump_mem_notifier(struct notifier_block *nb,
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unsigned long action, void *data)
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{
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struct memory_notify *arg = data;
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if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
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return NOTIFY_BAD;
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if (arg->start_pfn > PFN_DOWN(crashk_res.end))
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return NOTIFY_OK;
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if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start))
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return NOTIFY_OK;
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return NOTIFY_BAD;
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}
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static struct notifier_block kdump_mem_nb = {
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.notifier_call = kdump_mem_notifier,
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};
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#endif
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/*
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* Make sure that oldmem, where the dump is stored, is protected
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*/
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static void reserve_oldmem(void)
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{
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#ifdef CONFIG_CRASH_DUMP
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if (!OLDMEM_BASE)
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return;
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reserve_kdump_bootmem(OLDMEM_BASE, OLDMEM_SIZE, CHUNK_OLDMEM);
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reserve_kdump_bootmem(OLDMEM_SIZE, memory_end - OLDMEM_SIZE,
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CHUNK_OLDMEM);
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if (OLDMEM_BASE + OLDMEM_SIZE == real_memory_size)
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saved_max_pfn = PFN_DOWN(OLDMEM_BASE) - 1;
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else
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saved_max_pfn = PFN_DOWN(real_memory_size) - 1;
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#endif
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}
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/*
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* Reserve memory for kdump kernel to be loaded with kexec
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*/
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static void __init reserve_crashkernel(void)
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{
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#ifdef CONFIG_CRASH_DUMP
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unsigned long long crash_base, crash_size;
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char *msg;
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int rc;
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rc = parse_crashkernel(boot_command_line, memory_end, &crash_size,
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&crash_base);
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if (rc || crash_size == 0)
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return;
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crash_base = PAGE_ALIGN(crash_base);
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crash_size = PAGE_ALIGN(crash_size);
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if (register_memory_notifier(&kdump_mem_nb))
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return;
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if (!crash_base)
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crash_base = find_crash_base(crash_size, &msg);
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if (!crash_base) {
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pr_info("crashkernel reservation failed: %s\n", msg);
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unregister_memory_notifier(&kdump_mem_nb);
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return;
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}
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if (verify_crash_base(crash_base, crash_size, &msg)) {
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pr_info("crashkernel reservation failed: %s\n", msg);
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unregister_memory_notifier(&kdump_mem_nb);
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return;
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}
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if (!OLDMEM_BASE && MACHINE_IS_VM)
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diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
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crashk_res.start = crash_base;
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crashk_res.end = crash_base + crash_size - 1;
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insert_resource(&iomem_resource, &crashk_res);
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reserve_kdump_bootmem(crash_base, crash_size, CHUNK_READ_WRITE);
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pr_info("Reserving %lluMB of memory at %lluMB "
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"for crashkernel (System RAM: %luMB)\n",
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crash_size >> 20, crash_base >> 20, memory_end >> 20);
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#endif
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}
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static void __init
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setup_memory(void)
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{
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@ -580,6 +769,14 @@ setup_memory(void)
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if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
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start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
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#ifdef CONFIG_CRASH_DUMP
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if (OLDMEM_BASE) {
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/* Move initrd behind kdump oldmem */
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if (start + INITRD_SIZE > OLDMEM_BASE &&
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start < OLDMEM_BASE + OLDMEM_SIZE)
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start = OLDMEM_BASE + OLDMEM_SIZE;
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}
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#endif
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if (start + INITRD_SIZE > memory_end) {
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pr_err("initrd extends beyond end of "
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"memory (0x%08lx > 0x%08lx) "
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@ -644,6 +841,15 @@ setup_memory(void)
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reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size,
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BOOTMEM_DEFAULT);
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#ifdef CONFIG_CRASH_DUMP
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if (crashk_res.start)
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reserve_bootmem(crashk_res.start,
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crashk_res.end - crashk_res.start + 1,
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BOOTMEM_DEFAULT);
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if (is_kdump_kernel())
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reserve_bootmem(elfcorehdr_addr - OLDMEM_BASE,
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PAGE_ALIGN(elfcorehdr_size), BOOTMEM_DEFAULT);
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#endif
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#ifdef CONFIG_BLK_DEV_INITRD
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if (INITRD_START && INITRD_SIZE) {
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if (INITRD_START + INITRD_SIZE <= memory_end) {
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@ -812,6 +1018,8 @@ setup_arch(char **cmdline_p)
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setup_ipl();
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setup_memory_end();
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setup_addressing_mode();
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reserve_oldmem();
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reserve_crashkernel();
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setup_memory();
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setup_resources();
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setup_restart_psw();
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